/**
 *
 */
public class Node implements Collection_{
    private Collection_ head;
    private Collection_ tial;
    private int size = 0;

    public Collection_ add(Collection_ node){
        size++;
        return null;
    }

    @Override
    public Collection_ remove(Collection_ node) {
        return null;
    }

    @Override
    public int size() {
        return size;
    }
}
